In C many pre-defined libraries functions are available. you can create a custom library also. In order to create a new custom user defined library, you need a strong skills in C programming Language. basically libraries are two types, 1) User defined library and 2) Pre defined libraries.

Pre – defined Library functions

In C many pre-defined Library functions are available, In order to use the pre-defined functions, you need to include the respective headers in the code. In below table, you can find the list of header files, descriptions, and learning source links,

SL No	Library Name	Descriptions	ArunEworld Links
1	assert.h	Diagnostics Functions	N/A
2	cocale.h	Localization Functions	N/A
3	complex.h	A set of function for manipulating complex numbers	N/A
4	conio.h	console input/output	Link
5	ctype.h	Character Handling Functions	Link
6	errno.h	For testing error codes	N/A
7	fenv.h	A set of functions for controlling the floating-point environment	N/A
8	locale.h	Defines localization functions	N/A
9	math.h	Mathematics Functions	N/A
10	setjmp.h	Nonlocal Jump Functions	N/A
11	signal.h	Signal Handling Functions	N/A
12	stdalign.h	For querying and specifying the alignment of objects	N/A
13	stdarg.h	Variable Argument List Functions	N/A
14	stdarg.h	Accessing a varying number of arguments passed to functions	N/A
15	stdatomic.h	For atomic operations on data shared between threads	N/A
16	stdbool.h	Defines a boolean data type	N/A
17	stdio.h	Input/Output Functions	Link
18	stdlib.h	General Utility Functions	Link
19	stdnoreturn.h	For specifying non-returning functions	N/A
20	string.h	String Functions	Link
21	tgmath.h	Type-generic mathematical functions	N/A
22	time.h	Date and Time Functions	N/A
23	uchar.h	Types and functions for manipulating Unicode characters	N/A
25	wchar.h	Defines wide string handling functions	N/A
26	windows.h	windows platform-related library functions.	Link